Yes you could well be correct, but breaking into the US is very difficult, there is plenty of competition & lots of protectionism
Again yes you could well be correct, but 'minuscule profit margins'? from what I have seen on bike accessories it appears to be healthy margins
I echo your thoughts on the little guy being made redundant, I'm sure the boss won't go without.
You're confusing "margins". There are two of these that are relevant in business...the Gross Margin and the Profit Margin
Gross Margin (in a business like this) is the difference between what you buy something for, and what you sell it for. So if Planet X sells something for £10 and paid £6 for it, the Gross Margin is £4 or 40%
Profit Margin is what is left of all those Gross Margins after you've paid all your costs such as salary, warehouse rent, distribution etc etc. These are often very small %s of the Sales
For sure, Planet X will still have some positive Gross Margin %...often these businesses run on 40+% on smaller items. But currency movement post Brexit will have reduced the £4 to something like £3....but their Overheads remain exactly the same as before. So they don't have enough £3s coming in to pay for the salaries etc....so people are made redundant to keep the business afloat, no doubt along with other attempts to reduce overhead costs