I agree and this subject has, over the years, been beaten just about to death on this board (see links to two examples below).
Bottom line is that it is taxable income.
https://ttlc.intuit.com/community/tax-credits-deductions/discussion/plasma-donation-as-taxable-incom...
https://ttlc.intuit.com/community/tax-credits-deductions/discussion/i-know-for-some-stupid-reason-i-...
