Also, but correct me if I am wrong, Bitcoins are comparable to shares of a company. The whole Bitcoin network is controlled by the total number of Bitcoins. If you don't have Bitcoins and need to transact in Bitcoin, you need to buy some and become "shareholder", even if this is for the fraction of time you need to complete the transaction. Expanding the number of Bitcoins would mean open the network to new users and avoid having a centralized control.
I don't quite agree with this analogy but ...
A publicly listed company that does well splits its shares. A company that needs more money issues more shares and dilutes existing shareholders. As a shareholder which would you prefer?
Using Satoshis as units instead of Bitcoin is like a 100,000,000 for 1 split.