Yes - I have firsthand knowledge that people absolutely purchase random tidbits from the store to then resell in order to be offered a prized quota bag. I don't know if it's worth it. The math somewhat adds up.
Using easy numbers:
Well-known that the spend ratio for B25 is 3:1.
Birkin 25 price = 10k
You need to purchase 30k of merchandise to be offered a Birkin 25.
Let's say you purchase the following:
20k necklace -> you sold at 12k. 8k loss
5k bracelet -> you sold at 3k. 2k loss
2k blanket -> you sold at 1k. 1k loss
3k homeware -> you sold at 2k. 1k loss
Effectively, you spent 12k instead of 30k.
Then you finally are offered your B25 (10K)
Total net = 12k+10k = 22k
This is reasonable, and equivalent to the price of a B25 in the resell market. Along with building a relationship with SA, guaranteeing authenticity, and having the full in store experience.
Only thing is - it's not guaranteed you will in fact get your dream B25, and in what timeframe - not to mention the stress of selling and dealing with buyers.
***This is NOT worth it for resellers, because you can't mark the b25 much above 22k and expect it to sell.
some stores are less than 3:1 ratio I heard, a few stores only require a 1:1 spending ratio (I know, the word “only” sounds ridiculous lol)