I guess the whole point of these pro powers is to be a monkey money sink then.
Can't see it working out too well. The only powers I'm sure pretty much anyone uses are the farmer, a couple of cash drops to start a boss event with, and maybe a tech bot here or there, and wouldn't you know they already released the most valuable pro power.
Now if the pro of the spikes and glue unlocks the ability to place a weaker version using cash like btd4 that would be pretty based.