I used to receive such mail from Midway, Sportsmans Guide, Brownells, and a host of other companies. I haven't been buying much since the COVID shut-down affected my disposable (and other) income, so it has tapered off considerably. I still receive reminders from several firearms- and firearms accessory-related companies. I consider it a feature, not a bug. I wish the companies from whom I used to receive such mail would continue, but I understand that it costs them money to send those things out, and they don't want to spend that money where there's no return on investment.
It's unfortunate that this is a red flag to your wife, but I don't think it in any way reflects poorly on the company(ies). If anything, I suggest that her objection might serve as a red flag regarding your relationship with your wife. Why you would choose to not do business with a company that values your business enough to inform you of deals and special offers is beyond my comprehension.