[janfoeh]

Mostly you're not buying a chance to get rich, you buy yourself permission to dream about the "what if?" until the numbers are drawn.

[bryanlarsen]

And you don't need to spend very much money to do that. For example, buying a ticket once per year is sufficient. You can still dream about the win you'll get the next time you buy a ticket.

Group buys add a social context that has significant value too.