Technically not true, they have a PO box which at one point ensured their spare bedroom in their current home was fully rammed with tat, they also allow superchats sometimes during the weekly lives, check out the dedicated tracker tattle thread for those instances. They also have been pinged a few times for buying subs which is why they've got a large sub count without increasing views, the last particular batch of buying was a good year ago when they were trying their hardest to get back on the Disney media list after 'those old videos' resurfaced featuring gun toting tim and mildly racist jen.
They've been known for blagging a freebie where possible and doing a little creative freedom during lockdown in regards to the first nannys exact role (as educator) so they could claim tax credit for employees.
The 3 year staycation tour is where its been hitting them, as they've been spending all their cash on trying to usurp every other Disney vlogger by throwing money at lavish hotel stays and high value experences in the hopes they can do something the others can't. Yet their stagnant production levels on their videos have been hampering them for a while, as well as behind the scenes arguements. One of which I happily watched play out during their first couple visit to the Galactic Starcruiser... but don't take my word for it, take a look at my daily observations made in the tracker thread that year, I even made one of there vlogs during Tims drunen letching over the cast member girls, while jen had a strop and locked herself in the room for 1/3 of the total stay.
The Trackers are the essence of what happens when the unlikely vlogger gets big and famous without trying, and their partner abuses the sudden fame by jumping onboard demanding more and more visible attention in order to become a celebrity themselves. They hit their peak a few years back and have struggled during the last 3-4 years trying to mke it back to those heyday levels... like holding back a childs first haircut until theyre nearly 4 because they wanted it to be at the disney barbers, then messing up and realised they aged him out of the certificate. Also celebrating by doing a bucket item vacation, only to repeat it a few months later because the next door suite seemed better than theres...
Yes they don't have a patreon, but like Adam the Woo, they make their money through their shop as well as the current view levels 15 years of daily vlogs will get you. Have they deserved it, perhaps. But they certainly spend like no tommorow, and like Nick, Tim hides his alcoholism in plain site (the cork collection in the kitchen), just like Jen hides her addiction to daily lie ins post 12:00pm hands off approached to childcare, unless its the fear of letting them use cutlery or god forbid share a portion of her food EVER!) as well as her very demanding addiction to daytime soaps.
I can see Nick and Leighs end goal is to be like the trackers and they'll do anything they can to get to that goal, including fleecing the old to be finacially free, but at the end of the day all we can do is highlight the bad behaviour in the hopes people will see them for what they are.