Dedicated doesn't guarantee more money, but you have the potential to over a reseller account. After all, I have a dedicated server with cPanel etc, pay around $50 a month for it and I think 80GB of space is more for my cash than I would get from a lot of reseller accounts.
Uptime is pretty good too, only complaint is no Fantastico, but I can't have it all for nothing can I
Agree with the guys above, test the water with a reseller account unless you know you have a large customer base, less of an investment, less commitment if it doesn't work out and so forth.