Grow faster than inflation. Spend cash on items that don't depreciate at the rate of inflation. Exit before you run out of cash. Make sure pricing is set appropriately and has opportunity to increase in the future. Consider "introductory" pricing instead of "lifetime" pricing. And on the flip side, try to lock in pricing now for things you buy that might change in the future. So, buy lifetime licenses where it makes sense, but don't sell them.