chesedname, I did not mean a cursory glance. I mentioned Moshe and Rabbi Akiva to bring out that although an outsider may have questions, to the person himself things often make sense.
How can you tell me that the Pasuk is talking about Maaser Kesafim when the whole thing is a Minhag, and definately not a De’uraisa.
Aser Beshvil Tetisasher doesn’t necessarily mean that by giving you will get rich. It means give in order to get rich. Hashem says to test and see that the more you give the more you get back, and you don’t become poor by giving Tzedaka. This is something that you can try yourself.
Ad Sheyiblu is Pshat in the Pasuk, not in the Drasha that we learned.
The reason why you hear it applied to today although it really meant the authentic Maaser, is because the rule applies to all Tzeddaka.
In other words, you made three leaps:
1) To apply that Gemara to Maaser Kesafim even though it might not have existed at the time.
2) To apply Ad Sheyiblu to any Maaser, while it really should be kept to that specific Pasuk which was meant for that time.
3) To say that Aser Beshvil Shetisasher means that you’ll definately get rich, while it means that it’s a cause to get rich.