I have seen most people changed from being a contractor to being a full time employee, but not the other way around.

And that happened in startups that had maybe 20% chance of IPO or being acquired, and another that had maybe a 50% chance.

As far as I know, the rate (even for a 3 year experience graphics designer, or a programmer), can be $75 to $80 an hour. While a programmer with 15 years of experience may get $120,000 per year. So, the programmer with 15 years of programming experience earns $10,000 per month. At the same time, the programmer with 3 year of experience or the graphics designer will get $14,000 per month ($80 x 22 days x 8 hours). I know I have to buy my own insurance, but I can't imagine buying those for $4,000 each month... maybe $200, $300 at most. I probably need to pay Social Security (FICA) both way (myself and as self-employed = $210 x 2), but still, each month there will be extra $3,000 of income.

So is the above calculation correct? But most often, I do see contractors wanting or becoming full time, but not full time employees becoming a contractor. Does somebody know what the reason is?