People who want to use the current system to innovate and create jobs. The current system of venture capital often produces these situations when people have a huge amount paper "wealth". But this wealth is all pretty hypothetical. It's not like some of the "billionaires" can buy 1 billion things from the McDonald's Dollar Menu. It's all tied up in stock that can't be sold for a variety of reasons. Moreover, it's quite likely that the "billionaire" will end up with far less than $1b when he/she retires, even if everything is wildly successful.

Yet that big number encourages greedheads to try to tax something that doesn't really exist.

The “greedheads” are the ones wanting people to pay their fair share of taxes, and not the people who’ve hoarded billions in wealth, and are using some of that wealth to fight to continue tax avoidance?