I am a thematic collector and it was a dream to obtain a catalog..
Infact the only world wide catalog I know in my town is the 2001 SG catalog in the philatelic buerau..
SG catalogue 2009 was listed in
ebay for 60 Pounds but the postage to India was 90 pounds..
Myself being a sailor got a chance to go to UK so I purchased it and got the catalog by paying 5 pounds for postage..
So total I had to spend = 65 Pounds for SG 2009 5 volumes (Actual printed price is 45 Pounds / vol)
Being a collector who uses it for reference, I think catalog can be used for as much as you need depending on what you use it for.. at times I use it to find the year of issue, approximate prices. But if ur a dealer or some one who sell/purchase constantly, buying a recent catalog would be a good decission else what change does it make..