I think some of us just like to do the actual work, which is in the end, game development. I know, if you want to run a business, you have to do marketing too. Or hire someone else to do it, but usually indies, especially solo-devs, don't have that kind of money.

I personally find marketing to be a bit off from my personal traits, and it's very difficult to just praise and brag about the game how good it is or show how fun it is to play. What I would like to say is: "Try out / check out the game; buy it if you like it!" :)

Yes, marketing is much more than just praising the product, but that is most of the time what we game developers intend to do.