Regarding your questions:#1) If you're in this for the long haul and plan to wholesale frequently, you may find it worthwhile to work with a local attorney who can prepare an appropriate purchase contract for you, even using existing purchase contracts as a template.

Of course it's ridiculous prima facia, it's not even really worthwhile to posts like this seriously. 

I went back and forth with the insurance company for another 2 months until I found an insurance claim expert and he managed to get me a new roof absolutely free. roof was fix just 2 weeks ago and now a year later I'm glad to say it was all worth while. the rent is due to increase next month in September.

If a seller wants 50K and you want to pay 40K, how would modifying terms potentially make the transaction worthwhile?

Wouldn't you need to know the area to know if flipping there is worthwhile?

If your goal is to save towards the future and you can support the negative cash flow, having a paid off property when you're 50 is certainly worthwhile.

What forms/paperwork you need or how do evaluate the deal to see if a sub to is worthwhile or what?

At the very least, I think it's worthwhile to speak with a CPA and begin a relationship.

If the attorney has something to offer, the solo is worthwhile.

Time is the most valuable thing in all of our lives and I'd rather spend mine working on worthwhile deals.