I opened the 50k continental card and I'm considering opening the 30k united card as well because I can combine them for 80k total miles (with their merger and all)

I'd use the 80k miles and then just cancel the credit cards. My credit score is good for all I know... but is this methodology really bad?

Open credit cards, get bonus miles, use bonus miles, cancel credit cards... Just looking for insight or thoughts (I'm really new to all of this)


Thanks!