My first 30 $100 + 9 SNG's - checkup

[Irishboy]

Over the last 3 weeks, I have played 28 SNG's on Party, 1 on Paradise and 1 on Pokerstars.


Here are the stats:

1st - 4
2nd - 4
3rd - 6

Total entry fees: $3,270
Total prize money: $4,370 (got a 2nd place at Stars)
Net profit: $1,100

In $ % = 46.7%
ROI = 34.6%

Observations:
I see little difference at the 30, 50, and 100 dollar levels.
Typically 3 players are clueless. 3 are fair but too loose calling raises and big bets with KQ and AJ type hands.
1 or 2 play too tight, especially when the blinds reach the 50/100 level.

Questions:
I realize I don't have a large enough sample to draw any definite conclusions on these numbers.
That being said, has anyone sustained a win rate and ROI like this at the 100 + 9 level?