AAPL probably will get there @ 500.00. And investing on it is just a personal choice. Some of us feel comfortable doing under $5 stocks because we don't have much capital to put in. Some of us under $10, $20.
whenever, i scan for stocks, i usually ignore any stcoks above $30. My experience is if u can catch any good stocks under $20, u can expect 100% return in 6-9 months.
About AAPL, i had bought it @ 97 and sold around 190. Been long time. If i was holding AAPL, i would have made 400% return but I had read Nicolas Darvas in my starting days where he warns against falling in love with particular stock. That has been one of my rules not to get into pricey stocks which i love to own.