It just depends on the money you would spend.
For myself i handle it like that:
First i set a limit for myself, how much money i would spend.
- just for example 500k.
I would start to bet 100k. If i am still to low 100k more.... 100k more.... when i have the highest bet i will stop.
Alternative (for lazy guys) just bet your 500k. If i am top and get it, i am happy, if not... well... i just forget about it and enjoy my wealth
BTW. sorry for my bad english. But i hope i still could help.