Yes, the percentages on Tourism are a bit misleading. With Plutocracy, it is as if you have a 1% tourism income (as opposed to 1% bonus) on each planet. Which means that each planet gets 1% of total potential tourism income, based upon your influence area. The bonus (from, for example, aquatic worlds - 25%) adds a percentage to the planetary income from tourism, which requires a building (or this government) to multiply out. The wording should really be changed, it took me a little while to figure out the difference.