As Tas said, just get multiple keys. The process through the API is going to be much easier than scraping. Also, don't be afraid to apply for a rate increase. I applied for one and got approved for 200,000 queries a day.
I actually do upload videos from the API on a daily basis for automated youtube channel using youtubeuploader by Porjo on Github (I can't post the link since I have < 15 posts). All I did was make a video uploading a video using his API client and linked his GitHub page when they asked for supporting documentation and screenshots and it was approved .How did you do ? didn't they ask you for "fully-functional demo accounts, screenshots and documents in relation to your API Client" before increasing ?