This article coincidentally is an exception! A ton is the right order of magnitude:

The US Treasury says that $1 million in $100 bills weights 22 lbs[1].

The $115 million that they raised in the last few months would weigh about 2200 lbs.

[1] http://answers.google.com/answers/threadview?id=441929

edit: grammar

Epic win on the weight conversion :-)

Strictly speaking, a "plethora" should be an excessive amount of something.

It still might work in this context though, if you think the company has raised too much capital...

Well technically, a plethora is a 'large or excessive amount of something', so I think in this case it works, though it feels a little sesquipedalian.

https://en.oxforddictionaries.com/definition/plethora

The entry you linked to agrees with my definition:

"Strictly, a plethora is not just an abundance of something, it is an excessive amount."

We are in the superlative bubble.

"Epic win"

Would you say I have a plethora of pinatas?