14 candidates spent more in their constituencies than the Greens did in total, between them spending 17 times more than the Greens. All but 2 of these failed to get elected.
Danny Alexander (LD), 49908.64
Alexander James Amherst Burnett (CON), 49423.42
John Robert Lamont (CON), 48994.92
Michael Kevin Moore (LD), 47921.56
Douglas Garven Alexander (LAB), 47421.65
David Gordon Mundell (CON), 46843.63
Jo Swinson (LD), 42722.25
Christine Anne Jardine (LD), 42454.32
Tim Brett (LD), 42344.57
Anas Sarwar (LAB), 39337.32
Charles Peter Kennedy (LD), 38350.36
Robert Hill Smith (LD), 37920.29
Ian Murray (LAB), 36700.7
Mike Crockart (LD), 36412.76
The Lib Dems were profligate spenders on their "key" seats, and got nothing back from it. You do have to wonder where they were getting this kind of money from, certainly not the subs of their Scottish membership.
The SNP's biggest spender was Michelle Thompson on £26.3k. That didn't really work out as intended though.
You can also appreciate why the Scottish Tories / Labour and Lib Dems are constructed as accounting units and not independent parties, I very much doubt any of them could cover their huge operating costs from donations and subscriptions they raised in the Scottish parties alone.