Wow a lot of inspiration from your post! And a lot of questions!!!!
1-Why use Minergate if they will charge quite a bit when you try to withdraw? Even windows 10 has a bitcoin miner totally free.

2-How much did you spend to set up the first mining system? Is it working for you??

I totally agree with you about reinvesting the earnings!we have little to earn or loose, better to dream big and look into a brighter future!
Steem on, new follower in your list! ;-)