Juju you should be fine. While Magic and stamp shops have the highest freeze rate i think if you set the refresh rate to be something VERY reasonable you should be ok.
OH and I added 2 more videos to my guide. SL If you want you can link my guide to this topic or something so that people dont ask the stupid questions over and over and over again.
I ab'd today in stamp (with a firefox browser autobuyer) for almost 4 hours today and got well over 4m in stamps. I have done it on multiple occasions, so unless you refresh rate is like 1-3 you will be fine.