Can you invest in a shop multiple times to keep increasing the vendor gold?
The speechcraft perk is rather vague about investing multiple times, but I assume it is a 1 time deal for that merchant.
If anyone has tried it, let me know if you can just keep doing it to get more permanent vendor gold.
Best Answer
You can only upgrade a merchant one time with the Investor perk (Speech 70). However you can get another perk, Master Trader (Speech 100) which gives every trader in the world an additional 1000 gold. [Source: Game and Official Strategy Guide]