Think! How likely is it, you can get a 4000 USD 3D program for 300 USD from a legit reseller? Zero. The same applies to software X. They'll send you a nice package, it will look like it's a genuine article, yet, when you enter the serial and try to activate, you will get wonderful warnings all over the place and nothing will work. So by all means, this stuff is of zero value. Leave it be and save your money until you can afford the real deal...
Fail. When things seem too good to be true ... they're usually too good to be true.
Follow Mylenium's advice and save up for the genuine article.
If you're really strapped for cash then sign up for a class a a community college, take your student ID to the bookstore and buy a student edition. You'll get most of what you get in the full version (depending on the product), a legal upgrade path the the full versions, and support. You won't be supporting software pirates and you won't be giving your hard earned money to scammers.