Many here seem upset at the idea that Bloomberg is spending a lot of his own money to run for president. Running for president is very expensive. All other candidates are also spending a lot of money -- but they're spending a lot of _other people's money_, to whom they are now beholden. What do those other people expect to get in return for their financial support? Surely they don't just give away millions of hard ea…
For what it is worth, I got text asking for donation to Bloomberg's campaign. So I would not expect Bloomberg not taking money from large donors.
This is the same reason governments sell war bonds -- they don't actually need the $100. It rather serves to make ordinary people feel they are contributing something to the cause.