I am sorry to hear that. Yeah, being really cautious around those blue buttons has become a second nature for me over time. Useful feedback for @rondras, I guess.
Looking at it from the bright side, the mistake was actually not that costly. These days, the items in the starter pack are worth just little over 1 buck if you tried to liquidate. Ten players are worth zero RBN on the market, one is a borderline positive asset (that was obviously different when the game started fresh) and we all gradually stopped thinking in the original 100k RBN = 1 USD setup. You threw away a half of the buck rather than a half of the starterpack.
I mean, the next five bucks you might elect to spend can get you 1M RBN. Not sure if this is what devs planned but you effectively pay more for the priviledge to play than what you paid in Season 1 but the product is quite polished now so it actually makes sense to think of it as a $10 game now (five for account, five for RBN top-up to get you some breathing space).