I think the rationale for "automatically sent" (just how dumb and ignorant do they think we are?) handouts was to entice the players who, in GI opinion, might otherwise quit BB, to stay and perhaps acquire a taste for "luxury" and keep buying fake money to feed their addiction. Note that immediately after that promo they put on sale a large number of expensive buildings. 150 creds is not nearly enough to buy everything so they hope these players would buy "a little bit more" credits to purchase, say, Metal mine and Processing plant.
They probably figured out that the existing addicts will continue spending money anyway so there is no reason to target them specifically. But that is not all. There is another reason for not offering us that incredible deal.
They are well-aware that many of us planned to buy these premium facilities for the achievement. So, they first offered the Climbing wall to drain our savings before offering the plants we were waiting for. Now lots of payers will have to buy credits at the regular price. And no, the suitcases don't sweeten the deal.
{Summerville; the head honcho - Elloriana, lvl 58; Charleston, SC}