What’s the benefit for business owners to give a huge discount for client?

Hi all, I need some clarity from a business owner perspective. So I found a dress that I most likely going to get. Dress plus alterations would’ve costed me 5.7k. I was able to get it down to 4.7k but I recently found out that it went down that much because the alteration owner basically gave me a $600 discount from the original 1.5k. This kind of discount difference does make me nervous. Is there any incentive to do so from a business point of view? I don’t want to sound ungrateful, but to me a very large discount like that for something important makes me think they won’t take it seriously because I’m not paying a premium. I’d rather they be honest about it if they didn’t want to give that discount in the first place and doing it just for the sake of getting business.

For a bit of context, I might not need much alterations aside from the hemming and bustle. I’m a perfect fit for the waist and hip measurement and just need a padded bra for the bust. Also I’m paying it all in cash.

Edit: Also just to add, my wedding is in March of 2026 and this dress will come in around early to mid December. So peak season would already be over by then. I don’t know if that also plays a factor. This fact just hit me.