Honestly, that could be it. Signalling isn't always about showing off -- many times it's just about signalling a willingness to belong. Even signalling a willingness to belong to an objectively undesirable group.

So it could be signalling that you're not "puttin on airs" by acting superior to those around you who play. Or it could be signalling that you legitimately like to belong to the group around you who play. Or it could be simply signalling that you don't take yourself (or $2) that seriously.

According to the lotto machine at my local Safeway, you're also an avid supporter of local schools who got $X,XXX,XXX from lottery money.