This is a 'freemium' game and is designed to be frustrating...

I have paid real cash (a few pence once or twice) and got exactly what I paid for. They are not ripping you off. They are exploiting your frustration. Exactly what they want from you. Uninstall if you cannot wait or do not want to be exploited..

The problem is in this game, you paid too much and gained too little. $5 for 250 simcash, what 250 simcash can do in late game?

only a fraction of a cargo shipment fulfill, or about one single improvement of a residential zone, that's ridiculous.

i agree with the original poster, its freemium so either put up or go play something else, this game requires patience, ive stuck to level 10, have built up a good storage capacity and have nearly finished  area expansion, once thats completed i can concentrate more on gaining keys (i have over 60 so far) and then upping levels, thats my strategy, slow progress but progress with spitting my dummy out.