Postage at the retail level is an issue, but not nearly in the same way that bulk freight is right now.
You might see a 10-15% increase in postage. Hell, you might even see a 100% increase in postage, where package from the US goes from £15 to £30.
But global freight prices are currently exploding by logarithmic values. Containers that were shipping for $2500 are now costing $25000, and that increase of $22500 could complete sink a small company.
So that increase in postage from £15 to £30 sucks. But it's not going up to £150. Not saying that a postage increase doesn't suck, but you'd always have an option to stop at a retail shop some time when out traveling or on holiday, if you end up near one, and take a game or two home with you from there.
Publishers don't have any comparable option to keep their companies afloat.