Definately too risky. These are turbos that only pay out 9 spots (in addition to the .50 per knockout). From my experience, they are essentially bingo sessions, as way too many people chase to try and catch the knockout bounty. You will probably not come close to the money in most of these that you play.
If you want to play MTTs, I suggest you start with the $1, 90 player double-stacks SNG. Plenty of time to play before the blinds get too high, and they pay out 18 spots.
When you build up your bankroll a little, the $2, 180 player MTT SNG is decent - it also pays out 18 spots but since there are twice the entries, the top payouts are much better.
While the fee is a larger percentage in a $1 STT, I don't think it will affect your expectation as much as fact that the play in those games can be random at times. You're going to have to tread carefully until you get to at least the $10 SNG, because a lot of people below that level just don't care about the entry and will gamble with you.
If you stay away from the turbos, I think that these still are easy enough to beat that you can show a + ROI if you are even reasonably solid.