The reason nobody uses tapsites is because every time a tournament comes around, (especially a tapsite takeover tournament) lvl 80 commanders like biohazard over here, search the radar not for resources.... but for people COLLECTING resources to completely annihilate every troop you have on there to get tournament points. (because battle-fleets don't get themselves. Isn't that right Mr. 41 hellstorms?) That's why nobody uses tapsites, because nobody sees the 4000 disintegrators coming in before it's too late. If you raid them they get MORE tournament points from your dead offensive units, and EVEN MORE when they raid your base in retaliation. The result is the lvl 80 player laughing while taking a crystal bath in his shiny new bastion.
Here's a good way to counteract that. I call this one the "Lucy" trick (I patent this!!! Nobody copy and rename it!!!)
Grab a small army of air/artillery units. The bigger the army, the more time it will take to collect it all so pick about 1-5. You have three extractors three different kinds of tapsites (not including crystals). Send an equal amount to each This way even if a high level player managed to get your uranium tapsite you can still collect from your titanium and bioplasma tapsites. He can't attack all three of your tapsites at once, but he can do it one at a time so pull everything out the minute you get so much as a recon. Remember a small number of high capacity units is the key to victory here DON'T GET GREEDY. The idea is that you (Lucy) get your troops off the tapsite before he (Charlie Brown) kicks them. You get the resources, they send out everything they got for nothing (this is also a good trolling moment too), and your troops are safe. Yeah you might not get much (around 500-1000 of a certain resource) but if you make multiple runs, it can build up.
If you still don't get the reference
https://www.youtube.com/watch?v=055wFyO6gag