I used to hide some of my Festool purchases from the wife, but eventually the guilt built up to the point where I quit doing it. She eventually saw them all anyway when we were building our new house and she was out in the shop helping build the cabinets and trim. She saw the value and now doesn't say anything (well, not much) when a new systainer or something else arrives.
I've now tried a different approach: I will watch a Youtube review of a tool I would like while she is in the room- she'll say something like "that's really cool, do you have that yet?" When I say no, and if she follows up with "you should get that" , then that's my green light!! That worked recently with the GRS-16 rail square from [member=61691]TSO_Products[/member] via Bob Marino. Sometimes I do get the 'eye-roll' though.
I do owe her a new dining room table and mission-style bed frame- after putting up with me for 34 years of marriage (this June) I guess she deserves them!
Regards,
Gerald