Fifty Bucks. Here is what I would expect it to fund, in no particular order.
Administration, liason with ASC/government bodies, sanctioning of centres, maintenance of rules and dispute resolution.
League funds used to be insured by TBA - are they still?
Running of Nationals.
Lifetime awards system - chevrons etc - maybe look at apparel for the more difficult awards, eg 300 game cap, 800 series jacket etc.
Appoint and train a centre/region league coordinator who can talk to leagues about sanctioning, rules etc or train centre staff to do so (and yes, I know this overlaps with what Centre Managers should already be doing).
Quarterly magazine, posted to each member, with page/half page for each centres' news/events. Also with ball reviews, coaching articles, etc.
Yearly draw to send a random member + SO to see World Tenpin Cup.
Produce set of ads for use by centres (at a fair cost) featuring our stars of the sport for recruitment etc.
National discount scheme on production of TBA card - anything we can get from accommodation to zoo poo.
Social bowler membership scheme, with open play discounts & monthly tournament for members.
National bowler database to at least attempt to assign a 'par score' to centres for average adjustment purposes.
Membership should be paid as a $1/week surcharge on a league set. More frequent bowlers will pay more, sure, but they are also more likely to get more out of it.
If I think of any more, I'll add to the list.