Guest's preferred ride intensity continuously increasing? Is this a bug?

[TigressDragonblade]

I always assumed that a guest's preferred ride intensity was (supposed to be) fixed the moment the guest was generated. While playing Woodworm Park today, I was observing this guest named Owen. When I first started observing him, his preferred ride intensity was described as "between 1 and 4." He was thinking that the Wooden Wild Mine Ride was too intense for him and went to go on the gentle rides. A few rides later, he's much happier and I check his stats again. Now it says his preferred ride intensity is "between 1 and 8." I think "He's happier now, high happiness does cause guests to try rides outside their preferred intensity range." He decides to go on the big wooden roller coaster. I check back later, he's slightly less happy (it's been raining), and now it says his preferred ride intensity is "between 1 and 12." Clearly there's something else going on here. Is a guest's preferred ride intensity actually supposed to increase like that over time, or is there some bug?

I did have the guest flagged to show messages when he gets on and off rides, buys stuff etc., so I know it's the same guest.

I'm running build v0.2.6-0f92c3b in Windows 10.

[jensj12]

This is intended behaviour. As long as guests ride rides they like, their preferred maximum intensity rating will increase. It is therefore beneficial to put some gentle rides near the entry of the park.