Yes, I agree. I have suggested this years ago to AS, but the problem remains. Surprisingly, I would have thought that it was in Auction Sniper's best interest to advise when balance was running low, as it is 'a call to action' which will benefit AS revenue flow by bring cash in earlier than the current system. Yes, I know you can give them an authority to charge your credit card periodically (monthly) to top up your AS account, but I prefer to pay by PayPal and give NO-ONE authority to charge my creditcard periodically.
I only go and search for a balance occasionally, usually when it's too late, and when your trying to get a snipe set up before an auction ends... Forwarned is forarmed imho.