I'm running a campaign for a group of 6 level 8 characters. Last session, they went shopping, and I let them buy about 2 magic items each. On top of this, I let them each start with an extra feat and a free magic item when the campaign started (at level 8).
(Selling magic items to my players was a lot of fun for all of us! My question is not about whether that was a good idea – I believe it was the right call.)
Given how many nice things my players have, I'm thinking about balancing my encounters as though they were for a party of level 9 characters instead of level 8. Is this a reasonable approach for me to take?