A will is an excellent source. If someone else transcribed it then you shouldn't copy it verbatim to Wikitree without obtaining permission, just link it. (Good idea to add what is said about everyone on their own profiles in case the source is removed from the internet). If you transcribed it yourself it would better to post it on a free space page then it's easy to link to everyone mentioned. A long will can make a profile look overly wordy. That said, whoever did this should have left a note as to why it was done. The more wills the better say I but it's an awful lot of work.