Yes, the "robbing Peter to pay Paul" method of financing production costs is the proverbial "slippery slope." And a good indication that you might want to find a new employer.
I also think it becomes an even bigger problem when your company doesn't enforce the 50/50 outlined in most every shop's contract.
Example:
Worked for a shop that had a customer that developed multi-family residential properties. Despite the fact that the customer was 120+ on something like 75% of their invoices (to the tune of something like $90K or more), that shop continued to allow them to order signs with no down payment- and produced, delivered, and installed new orders.
Their answer, when I pointed it out at a sales meeting and offered the opinion that it needed to stop and wondered if they thought a bank would let them skate four months plus on the mortgage without a payment without starting foreclosure proceedings? "They're a big customer."
Uh, no- They're not. What they were/are is a drain on profit, and screwing the company by taking advantage of the fact that they're getting free products and an interest-free loan- not to mention the corrosive effect on the sign company's morale, because this same company cut out all vacation/PTO because "times are tight." (I left the company.)
At a couple of the shops where I was worked (including the one in the example above- they did a lot of stupid shit) they'd take the deposit (as agreed), do the fab work, get the sign installed, then... nothing. When I was the one who scheduled installations at the first shop where I worked, the first question I'd ask once the job was ready and the customer said "I'd like to get it installed on Tuesday" would be "okay, and would you like to pay for that with a credit card now- or will there be someone with a check for the balance of the work on site that day?" No payment, no sign (decal, print, channel letters, whatever). My installers were under instructions not to even begin work if they didn't get payment (if the job wasn't prepaid). Yes, there were a few customers that didn't have to follow this "rule"- but they were established customers who paid their bills within 10 days of the work being completed.