Gold can be used to "Claim Angels" without resetting your progress!
 
If you have earned a set amount of Angel Investors and you'd rather just collect your Angels instead of resetting your progress entirely, you can use the "Angel Claim" function to do so.
 
After you use the Angel Claim, your earned Angel Investors will add to your existing totals and boost your profits.
 
Angel Claims cost 20 Gold and are good for a single use.