You typically do not do a traditional inspection wit a home inspector. You, the wholesaler, are expected to look at the property and be able to determine what needs rehab and estimate the cost. The investor buyer will then look through the property to determine repair costs as part of their due diligence.
You need to inspect to make sure you are getting a good deal. The end buyer ispects to make sure they are getting a good deal.
If your end buyer wants a contingency for a traditional inspection with a licesed inspector - find a different buyer. It is reasonable for an end buyer to run a contractor throught the hous to get an estimate.