Hi Squeaks,
The reason for the wear on the pole joints is that you are using this as your main pole. Used for domestic work the pole is subject to many more section changes than normal. To counter this you will need to use the PTFE lubricant spray a lot more. This actually prevents wear on each section.
The other problem is end splintering, this is nearly always caused by hitting the ends on the section above whilst assembling. Using this pole on domestic work does mean that you usually have less room for careful joint assembly and therefore it can lead to chipping which coupled with wear can lead to splitting.
The way to prevent all of this happening is to regularly spray the joints with PTFE lubricant and then assemble with care. Having said that some of the above posts have also had some good ideas about prolonging the life of the pole.
Feel free to give me a ring/email.