These merchants are not checked in the 'Invest' column in the following tables, but instead the bug is noted on the individual merchant page. Some merchants are bugged - they have the dialogue allowing you to pay them 500 gold, but doing so does not result in any permanent change in the merchant's available gold. The Investor perk allows you to invest 500 gold in certain merchants, after which that merchant will permanently have 500 more gold available.The merchants who have more gold are all identified in the notes of the following tables.