It's a very dangerous approach. Your goal should be to make a fun & playable game (optionally to also make a lot of money, but that depends if you are a hobbist or a pro ). Your ego is irrelevant.
So should I buy some assets, or is that considered cheating. I'm not sure how I feel about it personally. I'd love it to be 100% my creation, but it would definitely speed thing up.
Cheat all you need to make a game. It's the only moral thing to do (no player will care what percentage of the product is made by you, they just want to have fun).