A lot of people in FOSS are Linux users, some are not. I personally love Linux and have been using it for 10+ years. For me it started with the philosophy behind it; I was amazed that people would work towards the greater ideal of producing a great product for the sake that it would be awesome if it existed and people could use it (similar to the reasoning behind scientists’ work before that too became overly commercialized), while traditional software companies produced …basically products that could make them profit, the the reasoning that …well they wanted profit. They would improve their products in order to stay competitive on the market …while Linux would improve in order to get better, cause better is better.
As time went by I shared my findings with those around me, I’d say, sure it’s not quite there yet but look what community effort is producing! And I’d use it on purpose as much as I could because I loved the idea of it. People, in response, were not very welcoming towards Linux. They would for the most part complain about the learning curve, or that the main thing they like to do isn’t available on it (mostly in regards to gaming), or that their favourite software doesn’t run on it …and the Linux compatible alternative, not that it’s bad …or lacks features, but looks different …and if the interface looks any different it’s more of a change than they are willing to deal with. That’s fine. Not everything is for everybody. But people became more informed as time went by and the arguments changed. They began to understand FOSS and the philosophy behind it and their indifference turned to dislike as they began to respect their commercial software more due to, according to them, there being more of an effort put into it …since after all it’s done for the sake of the ultimate motivator, money, rather than FOSS which is done mostly by volunteers, motivated by goodness knows what, who probably invest less time in it, and therefore obviously can’t be expected to yield similar results. Tools like photoshop were considered the power tools, while FOSS stuff were a bunch of toys. And many people began not so much equating the amount they spent on software as representing the software’s quality level, but more if there is no money involved it can’t be good software.
This was very upsetting. Now truth be told, I was never much of a gamer; so the next step was not a hugely hard one for me to take. In 2005 I uninstalled windows, since Linux was able to do everything I needed it to do, and I never looked back. I made a point of using FOSS exclusively and helping it get to where I want it to be, in the way that I am able to (I am no programmer, but testing doesn’t hurt too bad, especially when you care about that piece of software and improvements in it mean a lot to your own workflow).
Gimp I found was lagging quite a bit behind photoshop, and although it was able to do what I needed, I was eagerly looking forward to things like 16bit support or adjustment layers. I am really glad Gimp is getting there these days, and RawTherapee is really only lagging behind Lightroom in terms of popularity.
I strongly agree with humaity improving it’s standard of living for the sake of living better lives …and not just because if you develop a better way of life you can subscribe people to it and making money is great so let’s improve the standard of living for the sake of wealth production. So you can perhaps get somewhat of an idea why people who were ridiculed, and decided to leave commercial software and its adepts in the cozy warmth of their club, and chose to fight the good fight, and are now on the verge of celebrating an age in which FOSS not only catches up but surpasses many commercial software in various ways … that they may feel frustrated when the commercial developers come around basically saying “hey guys listen …looks like you’ve come a long way; and we are considering admitting you’ve come far enough that we might grace you with a port of our software which usually is too good for your lowly system. what do you say? party?”
I’m sure that wasn’t the intent of your post. I like giving the benefit of the doubt; but perhaps you can understand why it may sound this way to some of us who shared the same treatment for avid windows users in the past.
I didn’t bring up how years ago, before Microsoft dug itself deep enough in the dirt that it had to become a Linux contributor, mister Gates himself called Linux and FOSS the cancer in the world of commercial software and how it is the the greatest impediment for software innovation; due to it impeding the sales of commercial stuff …when profit is obviously the true source of innovation; not anyone’s desire to have better products. (paraphrasing of course) 
Hope I don’t get banned for the aggresive tone 
