For those that play online for a living, how realistic is this?

[Rick Diesel]

I have been seriously considering quitting the regular job to become a full-time poker pro. I have been charting my play over the last 6 months, but this is still a ridiculously small sample to work with. I have been playing exclusively SNGs on Stars, ranging from the $55 to the $109.

Here are my stats over the last 6 months.

1,000 SNGs
23.7% ROI (variance between $55 and $109 is immaterially small, but I actually do slightly better at the 109s)
3 tables at a time
Average a little less than 1 hour per SNG

So I did some math, and found out that if I maintain my current ROI, playing 3 tables at a time, for 9 hours a day, 5 days a week, 45 weeks per year, playing an even mixture of $55 and $109s, I would make approximately $115,000 in a year.

Now my question is:
Is a 23.7% ROI sustainable while playing 3 tables at a time, 45 hours a week, for 45 weeks?

Additional results: In case this helps in any way, in the 1,000 SNGs, i have the following places...
1st - 160
2nd - 142
3rd - 138

Thank you for any comments.