It's locked isn't it, so can only use it with that carrier and be paying them for service.
Unless you want it as a $150 paperweight, and not be paying Boost for service?
Locked phones can still be sold at subsidized prices, even if they don't have any contract obligations. Doesn't Boost do pre-paid, no obligation plans?
The original O2 locked iPhone in the UK was sold like that, was £159 instead of the full retail price of £599. And you were expected to take out an O2 plan via iTunes when you got home with it.