This does not necessarily mean the future will match the historical performance but I do not know of anything that would lead me to conclude that it is unlikely.  

I just started reading and watching videos on wholesale and investing into real estate.

Every encounter with their office in the last 3 years has lead to closed doors.

Offer expired and no MLS listed contact info lead to the agent.

I'm still having trouble bringing in solid leads.

It's cool.So you get high quality leads or subscribers coming to you.

I have seriously considered buying leads, and after a fair amount of research, I was really leaning towards "Bold Leads".

Also wholesaling is tougher than it appears to be successful at it you would likely have to spend hundreds or thousands of dollars on advertising to find seller leads, you likely aren't going to find anything that you can wholesale off of MLS unless you get a huge price reduction, and to do that you would need to find an agent willing to waste time writing many super lowball offers in the hopes that you get something. 

Here is a link for some more info on generating leads and blogging about real estate.

Get involved with the people who run things AND visit the office for 'Permitting' These guy and gals may have much to share about who's who' and they know the good ones.When you contact these leads you need to say, "It's great to meet you .... the people at Town Hall speak highly of you!"