By declaring it, you're so to speak "setting up" a precedent that involves paperwork and becoming included in the "records".
Based on personal experience and my business heavily involved with daily custom clearance it's better to be just the guy/firm, rather than the guy that on Dec 26/2016 declared 40k USD or a firm that declared a box of Iphone 15's as General cargo.
If you see majority short stacks anywhere in Macau, those are the regs who play like ****. I hear they mostly go to MGM. I haven't been back since before the pandemic but I used to live there. The games will be soft but tight. You can still make OK $ playing those games as long as you don't get too aggressive when you don't have it.