Please dont feel demotivated and dont give up - I do not think making a modest part time income out of a few sites is that unreasonable just so long as you do not want an excessive income. If you have fun doing the sites and getting involved with people then the money is the cherry on the top - and if you dont enjoy it then all the money in the world will not make it fun.
I think you nailed it there cyberpuppet. I am thoroughly enjoying what I am doing, I absolutely hope to make a trickle of money from it, of course - but that's a bonus as online entrepreneurship is a hobby for me right now.