Free all expenses paid luxury wedding & probably honeymoon too? And tons more cash? Why on earth would anyone NOT go for the TV wedding? It's not like they're selling their first born to Rumplestiltskin or Fleiss or anything.
I don't see it as pursuing TV or entertainment careers. I see it as good business. Accepting the gifts you're being offered for a short time. Then you're done. No further obligations. They'd be fools not to.