Though the replay bug still exists, nonetheless, you'll be able to watch a good technique to tower reselling for the first 7 mins and 48 seconds.

I've noticed a lot of people grasping the concept of income reselling, but can't seem to do it properly/effectively.

I've decided to show one of my replays of me reselling on Very Hard taking advantage of the 7 and 5 single passes; through my experiences, I've found it best to watch someone do the technique before putting too much effort into learning it yourself.

Unfortunately I don't believe you'll be able to see how I change it up against speed and shield. Also keep in mind I take full advantage of my opponents time. If it were just me solo, creeps would spawn right after I finish each wave, and despite my opponents being on easier difficulties I am able to clear them more effectively and efficiently.

Hopefully this will help you all and give you a general idea of how to resell.

Good luck!

Oh yeah I'm red in the replay.