You should give the option to sell some properties, such as cars, planes, houses, boats... If you make the mistake of buying too much, and you become overwhelmed with bills, you fall into debt, but you are stuck with these properties that are causing the problem. It's not like you get a second go at this game, so such a mistake could ruin the entire game for you.
It's also a nuisance that after the end of the month summary, it automatically takes you to the ranked tab. I need to keep clicking back to where I was every single month.
I got my MBA, hoping that I'd be able to get the highest paying job soon afterward, but it takes so many experience points to get it. By the time I got enough experience to get that job, I'd have gotten so many raises that getting the new job would hardly be an improvement on my income, making my MBA practically useless.