UPDATE:
Change #1: We will be changing the name to resemble a financial service rather than a cryptocoin. The new name is "RealPay" and the use of the symbol "R" will be kept at least for the beginning.
Change #2: We are keeping the number of 10 billion units but dropping the price to $1. The number has to be high because of our plans to expand in markets where PayPal is either not offered or has certain limitations like India, China, Japan and others.
Change #3: Profit from investments will be returned back to RP users in the form of dividends thus keeping the price at $1 at all times which will make things easier for users as well as merchants since you will not need to do any conversions much like with PP.
Note that bitcoin marketcap as of now is about $46 million. You are hoping to be 200x bigger than bitcoin. This may happen, but I have serious doubts about it.
The second thing you have to be aware of is how the already paranoid bitcoin community will perceive this: They will basically think: "This guy is asking us to give him 10 billion dollars in exchange for a hashcode". Even if your intentions are honest and you keep everything in AAA bonds that pay 6% a year, assuming you take 1% fee thats easily 100million/year. Basically, you are trying to be a large bank (and the govt will probably view it this way, which leads to its own set of problems).
On the other hand, if you dont have a fixed number of coins (generate as people want to buy) and focus on providing a tiny fee for transactions, you may make the same kind of money, but people will focus on the 0.1BTC fee instead. The govt may also ignore you.