Book and speaking deals are obviously being used as money laundering.
Huge advance payments, huge printings to wit royalties, dismal audiences.
Can’t prove anything, which is why they’re effective.
Yes they’re worth investigating.
Yes not every post POTUS deal is a scam, that’s apparent by the appropriate cost/value ratios.
Being paid near $1M for a 20 minute speech, or getting $10M for a book deal that sold 100,000 copies, well, something ain’t right there.
Reagan made $1 million for a speech in Japan in 1989. Presidents clean up after they leave office, through speaking tours and book deals and the like. Obama did it. Clinton and Bush made millions the same way. It's a bipartisan deal for former presidents and there is no reason to believe that Trump can't, or won't, cash in once he leaves office as well. I'd imagine his royalties would be in the same range.