Welk is a small system -- five locations and two more being built. The first question is whether you want to spend most of your time at one or two of these locations. If not, you might want to consider alternative developers with more options.
240k points in not very much. A two bedroom unit at Northstar is 420k points and a one bedroom at Village Place is 360k points. Breckenridge points are also high and I'm sure Hawaii will be high too. 240k could work for the older resorts (Escondido Villas, Palm Springs and Branson), but the new resorts require many more points. Cabo might be in between, 240k gets you a 1BR there.
I can't help much on pricing. My family has owned deeded weeks in Escondido since the 1980s. A few years ago we converted three weeks to points. We still have some deeded weeks as well.
I've not traded for any of the "Experiences" location. Many seem to me very expensive (points wise), but there are maybe two or three reasonably priced locations I might use some day. I can say that availability for Experiences units appears quite good compare to other timeshare systems that offer these kind of affiliations, but where availability is almost nil. Nevertheless, I've not actually made such a reservation, and, in the timeshare world, these are the kind of things that tend to change in the future. It's generally not a good idea to buy timeshares for the benefits offered by a developer, because developers regularly change those benefits.
Welk has always traded well in Interval. We generally exchange for Marriotts'. We don't get, for example, Newport Coast in July, but we regularly get it in the spring or fall. We're flexible with our timing -- which is a necessity for almost any timesharing. You need to be able to plan a year ahead and to be flexible with times and locations.
If you're interested in trading with Interval, there are less expensive ways to do that. Welk uses a two part pricing method for their annual fees. There's a fixed part (something over $600 I believe), and a per point part. This leads to the per point average fee falling as more points are acquired. So, for 240k points, you pay about $1,300 per year. We, however, own 780k points and our average fee per point is lower than yours. So, while your cost is about $1,300 for 240k, our average cost for the same points is slightly under $1,000. Moreover, my deeded weeks in the Villas at Escondido (a 2br unit rated at 240k points) costs only $980 annually. The point I'm trying to make is that a small Welk account is an expensive way to make Interval exchanges, and there are other less expensive options if exchanging is a major reason for buying this timeshare.
In summary, in my view Welk is a good system if you plan on spending most of your time at the Welk locations. If, however, you plan to spend most of your time exchanging, there are better alternatives.