So, I just received a very tempting but completely stupid as a business decision, offer today.

Do not let someone bully you into making a decision.   

You have control and choice over your own decisions.

Congratulations @Kyrin Veritas on your decision to take action!

The big flaw I see with wholesaling is that the seller is letting his property go for such a deep discount that once you bring up contingencies does he start second-guessing his decision and look for more money elsewhere...Hopefully there are others on here with more experience that can chime in. 

The improvement costs are a direct reflection on what I might make as profit and influence my decision on what improvements I can make.  

Ya'll are reading this part incorrectly.

We do analyze time versus cost, and when it's fairly obvious what the cost will be, like changing your oil, it's easier to make that decision.  

In this situation @Nick Stango you might consider doing the following:Contact the wholesaler you've been working with: tell him you're close to making a decision and would really like a contract.

That is because interest rates now are great and to be able to lock that a great rate in for 30 years seems like a solid financial decision and a smart inflation hedge.