Ancient Energy Booster- Why?

Greetings, I'll try to keep things succinct;

Of late, that is say the last two or three days, I've noticed an increasing number of people fielding decks with no ancient pokemon, but with Ancient Energy Boosters that they attach to cards that don't benefit. The game itself does not register there being any positive effect either. Is there something I've missed here, because I can't figure it out.

Thank you,

-Kitty