Is plant acquisitiveness a disease?

Since moving into this house 2 years ago, hardly a week has gone by that I haven't set foot in one plant nursery or another.  I'd like to claim that I just cruise through out of curiosity to see what's new but, to be truthful, I rarely walk out empty handed.  Is plant acquisitiveness a disease?  Should it be added to the next encyclopedia of mental disorders?

My husband recently tallied our 2012 purchases.  It appears that plants and garden supplies were at the top of my list of personal expenditures.  And it would appear that I'm getting off with a bang again in 2013.   During the first week of the year, I put in the following:

Grevillea lanigera 'Mount Tamboritha'

Loropetalum chinense 'Shang-hi'

I needed the drought-tolerant Grevillea to fill an empty space in my dry garden below a Guava tree and near a Correa pulchella 'Pink Eyre", Leptospermum scoparium 'Pink Pearl' and Phormium tenax 'Apricot Queen" I put in last year.  This Grevillea is reputed to bloom almost continuously so it's a bargain, right?

I needed the Loropetalum to fill in a spot formerly occupied by annuals in my backyard border.  Its foliage is darker than that of any of the other Loropetalums I've seen on the market so it was perfect to provide color contrast against the pink-flowered Argyranthemum frutescens and Cuphea 'Kristen's Delight' planted nearby.  The purchase was clearly appropriate.

Last Saturday, a friend and I went to Rogers Garden, a nursery in Orange County, ostensibly to listen to a talk on using shrubs to provide structure in the garden, although the Rogers gift cards burning holes in our pockets may have factored into the trip just a little.  However, I feel I exercised some self-discipline in restricting most of my purchases to plants already in use elsewhere in my garden, thereby treating one of the principal side effects of my plant acquisitiveness disorder:  hodge-podge garden design.  I bought 2 more Correa pulchella 'Pink Eyre" for the dry garden and 2 more Hebe for the backyard border (albeit different varieties - 'Patty's Purple' and 'Wiri Blush).  However, I admit that I veered a little off course with 2 other purchases:

Leucadendron salignum 'Chief'

Chorizema 'Bush Flame'

I do have 2 other Leucadendron.  I acknowledge that those are in the front yard while 'Chief' went into an empty spot in the dry garden that I thought would benefit from a tall specimen.  But this genus has done so well at our new house, how could I pass up adding another when I have space available for it?

In honesty, the Chorizema was a complete impulse purchase, although I think it will complement the 3 Abelia 'Kaleidoscope' I have in the back border.  I broke another of my personal rules on this purchase and got it in a large container instead of the small containers I try to stick with but it was the only size Rogers had so what could I do?  I saw this plant years ago on a garden tour in Santa Monica and I still remember the impact of its magenta and orange flowers.  Passing up the plant the first time I've found it in a local nursery would have been a crime, wouldn't it?

I've noticed that a number of garden bloggers have recorded their first plant purchases of the year so at least I'm not alone in suffering from plant acquisitiveness disorder.  (Check out danger garden and Parallel 49 Palms & Exotics for accounts of their new year's purchases.)