But you are not paying for a service, because funding OpenSSL is a classic free rider problem: the company would be better of not funding OpenSSL, even though all companies would be better off if they all funded OpenSSL.
By that logic, the tax accountant could argue that they should arrange a company's finances so they pay more tax, in order to pay for more "stability" by funding the government.
Does it matter about everyone else though? Your company values rock solid encrypted communication and it willing to pay a premium to ensure this it remains rock solid. The fact that everyone gets it is just a side effect of that.
Lots of corporate IT people can get away paying $300 for a cert and know $200 of that is going to a good cause.