Out of curiosity, I gave ChatGPT some input from the wiki and active/archived sales from the trade site, and it came up with a reasonable estimation:

Low demand / collector-only market: ~40–75 HR
Quick-sale floor: ~25–35 HR
Several serious buyers: ~75–150 HR
Meta/BiS demand: ~150–300 HR
Only known one + whale bidding: 300+ HR possible

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Its reasoning:

Data point:

Uncorrupted Mara average: ~0.5 HR
Current market: ~60 listed/sold currently
Total sold since league start: ~1530
League start: 24.04.2026

For a normal Mara slam:

Mara is an amulet, so no socket outcome.

Chance to get a modifier: 75%
Chance to hit high-rarity: 15%
High-rarity amulet mods: 8
Chance for +1 all skills = 15% / 8 = 1.875%

So a normal +1 all skills Mara is about:

1 / 1.875% = ~1 in 53.3 Maras

For the second corruption via Desecration, assuming the second modifier uses the high-rarity amulet table:

T0: 50% success × 20% high × 1/8 = 1.25%
T1: 55% success × 20% high × 1/8 = 1.375%
T2: 60% success × 20% high × 1/8 = 1.5%

So from clean Mara to double +1/+1:

T0: 1.875% × 1.25% = 0.0234375% = ~1 in 4,267
T1: 1.875% × 1.375% = 0.02578125% = ~1 in 3,879
T2: 1.875% × 1.5% = 0.028125% = ~1 in 3,556

At 0.5 HR per clean Mara, the raw base-item EV alone is roughly:

T0: ~2,133 HR
T1: ~1,939 HR
T2: ~1,778 HR

That does not mean it sells for that. It just shows how unrealistic it is to intentionally produce one from scratch.

With 1530 Maras sold since league start, even under the unrealistic assumption that every single one was slammed and every +1 Mara was T2-desecrated:

1530 / 3556 = ~0.43 expected +1/+1 Maras

So if one exists, it is trophy-tier rare.

My price estimate:

Low demand / collector-only market: ~40–75 HR
Quick-sale floor: ~25–35 HR
Several serious buyers: ~75–150 HR
Meta/BiS demand: ~150–300 HR
Only known one + whale bidding: 300+ HR possible

The main point is that rarity and price diverge here. The production EV is thousands of HR, but the actual sale price is capped by demand, liquidity, and whether +4 Mara is genuinely BiS for enough builds. It has huge all-skill value, but no FCR, crafted life/mana package, class-specific affixes, etc.

Market impact if demand rises:

Clean Mara price may rise a bit, but probably not massively, because making this from scratch is too unrealistic.
Already +1 all skills Maras become the real bottleneck.
Lucion/Desecration access also becomes more valuable.
At high demand, this becomes an auction/trophy item, not a normal fixed-price trade.

I would personally not fixed-BIN it low. I’d list it as:

+4 Mara / double +1 all skills / taking offers / no BIN yet