In 13 years when I will desire the income I will be cashflowing extremely well which will again give me a lot of options which is most important for me.

I don't mean to sound demotivating, but I think it's important for you to understand that real estate investing is difficult, wholesaling requires a lot of work, and making money in this business when you have none requires a thorough education and more work than most people are willing to put in.If you have the motivation, desire and the work ethic, start reading!

How you view things has an effect on your desire, drive, enthusiasm, etc...

I'm definitely confused as I do not want to get properties on contract without knowing if the deals are desirable for buyers.

Decide if you want high cashflow or building equity/safety as your most desired trait.

This allows us to drop off the selling commission if we so desire.

Even though it is only a rental, CURB appeal impacts people's desire to want to rent it, and thereby you able to get a little higher rent.Also, Appraisers are human as well.

Since you mentioned they aren't in very good areas they won't have strong owner occupant desire either which is the only hope to get more of a markup.How did you determine your guess on FMV beforehand?  

Desirable.  

You just have to identify the properties you find desirable and how much you are willing to pay, then hope it actually goes to sale (and isn't postponed or stayed) and then hope you can get the winning bid below your max bid number.