is this a good formula for shared hosting

[Deltahost]

hey i have worked out this formula to work out how much i can sell my server for so here it is
GBx4=BW
and the prices
GB=price+.50
so a 5GB plan would have 20GB of bandwidth and it will cost $5.50 Per month

and a 10 GB plan would have 40GB of bandwidth and cost 10.50 per month

are these ok prices ?
and i will have good support and the servers will not be over sold

Forget about BW limitation. It will scare potential customers. In case of shameless use you always can shape speed to fit to reasonable BW.