HSMOM,
Another way to look at a slot host or table host is that they're employeed by the casino to make you feel good about losing money to them. They will pamper you and give you free meals, rooms, show tickets, etc. as long as you keep gambling. They will make you feel like the most important person in the world as long as you keep gambling. They'll do anything they can reasonably do for you as long as you keep gambling. Your average bet and number of hours played will determine the level of 'comps' they will offer you.
Being a member of the slot club will get you the cash back or comps available for whatever points you earn while playing. A host has the authority to comps beyond this. Sometimes they will, sometimes they won't. If you play nickels or quarters for no more than a couple hours a day, a host probably won't help you much. If you play quarters or above and play at least 4 hours a day, preferrably more, you need get established with a host.
jm
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Jeff