K7JBQ: Almost every time, it's due to putting just a little too firmly.
At least someone is being honest, speed and line are the two reasons for lipouts. happens on a real course, happens here too.
As for using "rocks" they putt the same as any ball.....just a faster meter.
As for buying balls, as already said, WGT is a business and we have choice. For me, the cost of buying balls reflects pretty cheap entertainment and for many, all it takes is an investment of their time if they do not or cannot open their wallet.