The problem with getting a reseller account or dedicated server that is too cheap is that quite often these super cheap services are unreliable. You may not be able to sleep peacefully at night if you have to keep worrying about when next the server will go down.

I dont recommend going below $4.00 for any of your packages, unless you plan to charge extra for support. You will find that the time spent supporting 10 four dollar customers may not be worth it, however it'll be much easier to support 4 $10 customers. Same $40 revenue.