Resuggestion, thanks to Blaze for the info!

MPTF:

https://marketplace.tf/items/5758;6;td-518/Anger%20Strangifier

$5.56 / $1.76 = 3.16 keys

$6.35 / $1.76 = 3.61 keys

$5.28 / $1.79 = 2.95 keys

$0.65 / $1.79 = 0.36 keys

SCM:

https://steamcommunity.com/market/listings/440/Anger%20Strangifier

(only taking sales above buyers at 5.15 CAD)

Dec 28:

5.45 / 2.903 = 1.88 keys

Jan 01:

6.19 / 3.286 = 1.88 keys

Jan 04:

6.10 / 3.321 = 1.84 keys

Jan 09:

5.81 / 3.357 = 1.73 keys

Jan 21:

5.61 / 3.294 = 1.70 keys

Feb 04:

5.21 / 3.257 = 1.60 keys

Feb 08:

5.16 / 3.294 = 1.57 keys

Feb 11:

5.16 / 3.225 = 1.60 keys

Feb 14:

5.99 / 3.261 = 1.84 keys

Feb 20:

5.72 / 3.293 = 1.74 keys

Mar 02:

6.10 / 3.222 = 1.89 keys

Mar 09:

6.09 / 3.263 = 1.87 keys

Mar 13:

6.12 / 3.253 = 1.88 keys

Mar 14:

6.14 / 3.275 = 1.88 keys

Mar 15:

5.38 / 3.248 = 1.66 keys

6.15 / 3.248 = 1.89 keys

6.02 / 3.248 = 1.85 keys

Total sales @:

0.36

1.60

1.66

1.70

1.73

1.74

1.84 (x2)

1.85

1.87

1.88 (x4)

1.89 (x2)

2.95

3.16

3.61

Sellers on MPTF for $4.50 (~2.51 keys)

Sellers on SCM for ~1.86 keys, 1.89 keys,

Buyers on SCM for 1.59 keys,

Taking 1.60 - 1.85 keys

Blaze's Part:

majority of your sales seem to be at 1.9 keys so i would include that here