The cost of breaking 135 is closer to 1 million $, for a 99.999% chance of success. That is only the price for paying the electricity bill. You also need a bullet-proof distributed management system to sync data.
Relying on luck without a risk strategy will just end up as losing time and money.
Tens of thousands will get you nowhere, unless your risk ratio is around 1 to 1000. Very low chances you'd get to the solution with that amount.
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I have never used GPU for puzzle searching.
Only keyhunt, I like it and I enjoy playing with the "spaces".

Question... with a GPU system is it possible to search for multiple public addresses together or just one?
do software that use GPU accept a .txt file like the one generated by keysubtracter?