What's the catch?

Thanks for the advice.

What's the advantage to selling in small increments?

You might want to consider encrypting your wallet and putting it into an encrypted container before putting it on the usb stick. An alternative is encrypting your wallet in an encrypted container and uploading it cloud storage so there is no risk of losing the usb stick.

www.dustcoin.com also has good comparisons for most of the major(ish) coins and what return you can expect from mining.

Welcome, please stay safe.